is it true ARP only works in single broadcast domain and arp packets are not routed frm 1 network to another ?
can any one give me any example or any source of info for this
hoping for positive response.
ARP was first defined in RFC 826. It is evident from the content that discovering the MAC address of a target IP-address is only useful, for packet delivery, within a single local broadcast domain.
ARP packets are a Layer 2 frame. To route anything, you need IP addresses, which are contained in a Layer 3 packet. An ARP packet simply does not contain enough information to be routed.
Yes, that is basically correct. One can however proxy arps, see http://en.wikipedia.org/wiki/Proxy_ARP.
But why would you want to route ARP, it's only of use on the target segment - what would you hope to achieve?